Book excerpt: "In the twenty-first century, military marine mammals detect lost equipment and underwater mines. Large rats are trained to find land mines in more than 80 countries. Military working dogs search for explosive devices and other weapons and are trained to take down enemy combatants. In earlier centuries, military fighters rode horses into battle, relied on elephants to haul supplies, and trained pigeons to carry messages. Even cats, goats, and chickens have served in wartime--as mascots! Learn about the history of animals in warfare, the functions they serve and how they are trained, as well as the psychology that makes animals such good partners in warfare."--Publisher's description.